The double vision of the elderly may be related to senile cataract, refractive error and vascular disease. 1. Age-related cataract: In the early stage of cataract, due to the uneven clouding of the lens, light rays are irradiated on the lens with different transparency and refracted to the retina, so the patient may have diplopia. 2. Refractive error: for example, astigmatism, low-grade astigmatism patients with age, the symptoms will gradually aggravate, double vision, especially retrograde astigmatism, more obvious, and may be accompanied by eye soreness and other symptoms. 3. Vascular diseases: The functions of organs of the elderly gradually deteriorate, and they are prone to diseases such as high blood pressure and arteriosclerosis. These diseases can lead to narrowing, blockage and rupture of blood vessels, thus causing blood supply disorders. When the blood supply to the eyes is insufficient or blood seeps into the vitreous body it will cause diplopia. When the elderly see double vision, it is recommended to consult a doctor in time, follow the doctor’s instructions for further relevant examinations, clarify the cause with the doctor’s help, and carry out targeted treatment or therapy.